A
Alan J. Drake
Researcher at IBM
Publications - 63
Citations - 1277
Alan J. Drake is an academic researcher from IBM. The author has contributed to research in topics: Clock signal & Synchronous circuit. The author has an hindex of 17, co-authored 63 publications receiving 1252 citations. Previous affiliations of Alan J. Drake include GlobalFoundries & University of Michigan.
Papers
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Proceedings ArticleDOI
A Distributed Critical-Path Timing Monitor for a 65nm High-Performance Microprocessor
Alan J. Drake,Robert M. Senger,Harmander Singh Deogun,Gary D. Carpenter,Soraya Ghiasi,T. Nguyen,Norman Karl James,Michael Stephen Floyd,V. Pokala +8 more
TL;DR: A distributed critical-path timing monitor (CPM) is designed as part of the POWER6trade microprocessor in 65nm SOI and is capable of monitoring timing margin, process variation, localized noise and VDD droop, or clock stability.
Proceedings ArticleDOI
Active management of timing guardband to save energy in POWER7
Charles R. Lefurgy,Alan J. Drake,Michael Stephen Floyd,Malcolm S. Allen-Ware,Bishop Brock,Jose A. Tierno,John B. Carter +6 more
TL;DR: During better-than-worst case conditions the guardband management mechanism reduces the average voltage setting 137–152 mV below nominal, resulting in average processor power reduction of 24% with no performance loss while running industry-standard benchmarks.
Journal ArticleDOI
Resonant clocking using distributed parasitic capacitance
TL;DR: In this article, a resonant-clock generation and distribution scheme that uses the inherent, parasitic capacitance of the clocked logic as a lumped capacitor in a negative-resistance oscillator is described.
Journal ArticleDOI
Introducing the Adaptive Energy Management Features of the Power7 Chip
Michael Stephen Floyd,Malcolm S. Allen-Ware,Karthick Rajamani,Bishop Brock,Charles R. Lefurgy,Alan J. Drake,Lorena Pesantez,Tilman Gloekler,Jose A. Tierno,Pradip Bose,Alper Buyuktosunoglu +10 more
TL;DR: Power7 implements several new adaptive power management techniques which, in concert with the EnergyScale firmware, let it proactively exploit variations in workload, environmental conditions, and overall system use to meet customer-directed power and performance goals.
Journal ArticleDOI
Active Guardband Management in Power7+ to Save Energy and Maintain Reliability
Charles R. Lefurgy,Alan J. Drake,Michael Stephen Floyd,Malcolm S. Allen-Ware,Bishop Brock,Jose A. Tierno,John B. Carter,Robert W. Berry +7 more
TL;DR: The authors present a mechanism that reduces excess voltage margin by introducing a critical-path monitor (CPM) circuit that measures available timing margin in real time, coupling the CPM output to the clock generation circuit to rapidly adjust clock frequency in response to excess or inadequate timing margin.